The Wendigo

A Wendigo (also known as windigo, weendigo, windago, windiga, witiko, wihtikow, and numerous other variants including manaha) is a demonic half-beast creature appearing in the legends of the Algonquian peoples along the Atlantic Coast and Great Lakes Region of both the United States and Canada.
The creature or spirit could either possess characteristics of a human
or a monster that had physically transformed from a person. It is
particularly associated with cannibalism. The Algonquian believed those who indulged in eating human flesh were at particular risk; the legend appears to have reinforced the taboo of the practice of cannibalism. It is often described in Algonquian mythology as a balance of nature.

"The Wendigo was gaunt to the point of emaciation, its desiccated skin pulled tautly over its bones. With its bones pushing out against its skin, its complexion the ash gray of death, and its eyes pushed back deep into their sockets, the Wendigo looked like a gaunt skeleton recently disinterred from the grave. What lips it had were tattered and bloody [....] Unclean and suffering from suppurations of the flesh, the Wendigo gave off a strange and eerie odor of decay and decomposition, of death and corruption." -Basil Johnston